Ten brief cases allow the reader to match wits with ten-year-old crime-buster, Encyclopedia Brown, as he investigates such cases as whether a diary of George Washington's mother is authentic, or if a UFO picture supposedly taken by the army is real.

The case of the stolen stamps --The case of the secret UFOs -- The case of the scrambled eggs -- The case of the Roman pots -- The case of grandma's cookies -- The case of the grabbed groceries -- The case of the giant shark tooth -- The case of the missing medallions -- The case of the shipwreck -- The case of Mrs. Washington's diary.